Pitman end



R. C. BAKER.

PITMAN END.

APPLICATION FILED APR- 2|. 1920.

Patented Aug. 1, 1922.

INVENTOR Reuben fifiaker A TTOR NE Y assess c; BAKER; rammar, CALIFORNIA, Ass'reivoni 'ro":errxnitcesrrie snon COMPANY, or oonirirnenj cnniron nmi'e communion- 0 t museums;

rrrivmn- Em specifibamrv bf Letters Patent? Application-filed. April 21, 1920. Serial *N'OE375A22;

- California,-ha'veinvented anew and iuseful Improvement-1n Bitmen Ends; otwvliich the following is aspecification.

This:invention-relates to a well rigf and particularly/pertains to a bearingrconstruction. for.- walkingabeampitmen.

Due to the-fact that it is common practice toPform'pitmenptwell rigs of wood, it isdif fieultto provide a suitable bearing for the crank pin to insure that excessive and ob jectionalo'le wear will not take place.

It is theip'rinfcipal object of the present'in vention, therefore, to provide an adjustable bearing adapted to be readily operated to securethe crank pin and to permitthe Wear in the bearingi'to beeasily'taken up as it occurs and to furthermore" provide simple means whereby the hearing may be instantly and easily separated to disengage the crank pin.

The present invention contemplates the use of a bearin'gv structure adapted" to be'rigzidly secured to the end of a pitman and to partially embrace a cranlrpin, said structure also providing guides for a supplemental movablebearing, portion adapted to com' plete the circumscribing bearing for the crank piir and to be adj ustably disposed in relation thereto. I

The invention is illustrated by way of eX- ample in the accompanyingdrawings, in which:

Eigurel isa fi'agmentaryview in section andeelev'atio'n showingthe complete pitman' structure with parts broken; away to more clearly disclose the adj ustable mechanism.

Fig. 2 is a view in central longitudinal section' through the bearing; and the pitman Fig. 3 is *aview in perspective-showingbne of the adj ustin'g; plates.

In: the drawings 10 indicates apitman adaptedhto be operatively connected to a crankpin-ll; This *pin is in thepresent instance, surrounded by anti-frictionbushings 12 and"13 'Which i are ma de 'as a part of and solidly anchored to the bearingstructure with which the present invention is particularly concerned: Thebearing'sstructureconiprises alower-semicircular: bearing-block '14; having a semi-circular recess therein torreceive thehushingi1:2; This bloclo is held in position by a strap 15" which is. drawnaround' the outer semi-circulan contour of the bearing. block 14' and is secured by bolts lo to the pitman. The terminating ends ot this strap are formed with-inturned' lugs 17 adapted to become enibedded withinthe opposite sides of i the p itman "and-thus to hold the l straps against longitudinal move"- ment. The bearing; block 14 j is also formed with a follower Way, 18. This way is bounded alonglopposite sides byvertical guideslt) and-20 which guides extend around thepp posite edgesofvthe recess in the bearing h'loclr and extend vertical and parallel; Aifollowe'r block 21, which is fitted with bushingsl3 is adapted to slide vertically between said guides in order to hold crank i pin 11: in- ;its operative position v and v form 'the upper half ofthe bearing. Outwardly extending-dough tudinal lugs 22 are formed 1' along-1 th mop-p0 site faces of block- 21 and slide-in slots 23:01 the giuides 19 and 20. By this eirpedientthe itollower block may move vertically without lateral movement in any direction: The guides are securely heldagainst the eIrd of the pitinan by capscrews 24: which project into 1 outwardly extending; shoulders formed at the upper ends ottheJguidesf and 'wlrich abut against the end of the pitm'an- 'iwhere it is out to receive the-Epitm 'an endwand also by bolts 16 which-secure the straplendto t-he p m 's l Positive vertical adjustment is provided the followeriblock Th isconstruction comprises a pair ofadjusting plates; 25 adjustin'g b'lOGksl :26 and bolts 4 The adjusting plates 25- are"moreclearly-shownrin Fig-r 3 where it will be seenfthat they haveflat body portions adapted torest aipon the outer sides of the 'guides' ltl and 2 and out-turned flange's' -28i 'llhe-upper" faces of; theseflanges area outwardly; and! downwardly tapered; to receive similar; faces: of the adjusting blocks 26; Longitudinal slots 29%- are formed through the body plates'ofthememloers 25 andreoeive cap screws 30-. These-cap screws extend through the body plzttes'z z-aHd intozthe gitidememhersflQ land -20iofwthe bejzi'ringblock and arefor the purpose of rigidlyrholding said adj ustingl pl ates-25 to'their adj usted positionaetuated-byadjustingbloelrsflti These adjusting; blocks- 26 are flat onH-theirupper faces to bear" against the out-.turned-flanges oft the guides: and, have -tapereehlewer faces agreeing;- substantiallywith the-tapen of the tion of adjusting screws 27 which, as shown in Fig. 1, are formed with an enlarged threaded portion passing through the adjusting blocks 26 which are threaded to receive them, and a reduced threaded portion passing through the strap 15; The outer endof this reduced portion is formed with a nut head so that by rotation of the screw the adjusting block may be moved in or out as desired, it being understood that the threads uponthe reduced portions of these screws arenot 'infengagement with any threads at the openings through which theyjpass, these threads being used only to receive lock nuts i 28 by which the screws maybe secured in their locked position and the adjusting blocks26 thus held. 1 i

an instant release'of the follower block 21 may be 'brought about by the lock bolt This bolt has a cylindrical body portion at its opposite ends and an eccentric lock member 29 intermediate these ends. The lock inember29 'ismore clearly shown in Fig.2

where it will be seen tooperate within a transverse opening SOthrough the follower block 21'. The opposite cylindrical ends of the lockbolt' 30 'extend through openings 31 in" the adjusting plates 25 and thus the lock bolt 3O will-move simultaneously with the adjusting plates 25, in'which thelock bolt has its bearings, when adjustment is being made. A crank '32. is secured upon one end of lock bolt. and provides means by which this bolt may be rotated to raise the follower block 21 thereby releasing the crank pinll. Infoperation of the present invention the bearingblock l l'may be securely bolted to the pitmanwith thefollower block 21 between the guides 19 and 20 after which the babbitt bushings 12 and13 may be renewed by repouring. 'Wearcan be taken up or ad justment' of the bearing made by loosening cap screws 30 and then rotating adjusting 7 screws 27 to force the adjusting blocks26 inwardly it being understood that-at this time the'lock bolt 30 'is in the position shown in "Fig. 2." The inward movement ofthe blocks will; "therefore, cause a i wedging action against the flanges 28 of the adjusting plates -25 and will force these'plate's downwardly;

inso doing the lock bolt 30% will also be forced downwardly and will act upon'the follower block 21 to force it'firmly against the crank'pin 11; When proper adjustment qhasg'been made the cap screws 30 are tightened "tofirmly hold adjusting plates 25 in "their adjusted position and. lock-nuts 28 are tightened to firmly hold the adjusting screws 7 27 and the adjusting blocks 26. In the event that the crank pin 11 is to be released the lock bolt 30 is rotated by the crank 32. This action discontinues the pressure on and raises the follower block, thereby giving suflicient clearance to remove the hearing from the crank pin. i

It will,therefore, be evident that by means of the present invention the bearing of the pitman end on the crank pin may be constantly tightened as required to prevent lost motion and consequential pounding and when desired the bearing may be instantly released to permit removal from or may be instantly tightened for engagement with the crank pin. 1

While I have shown the preferred form of my invention as now known to me, it will be understood that various changes in the construction, combinationand arrangement of parts may be made by those skilled in the art without departing from the spirit of the invention as claimed.

Having thus described my invention, what I claim and desire to secure byLetters Patent, is:-

tween said guides and forming a bearing cap for the crank pin seat in the bearing block; a lock bolt journaled in the bearing block and having a cam portion extending within the follower adapted to retain the bearing cap and the bearing seat in a desired relative position or instantly separate them.

2. A hearing structure comprising a hear ing adapted to be secured to the end of a pitman; a bearing seat formed therein for receiving a crank pin; guides formed on opposite sides of the seat; a follower block positioned between the guides and having a segmental end to form a cap for the bearing seat; wedge means for taking up the wear in the bearing; and a lock bolt journaled in the bearing and extending within the follower block for instantly separating the cap from thebearing seat.

8. A bearing structure comprising a hearing having a shaft receiving seat, guide members extending from opposite sides of said seat, a follower block slidably mounted between the guides and having a segmental end so as to form amp for the bearing seat; wedge means foradjusting the cap in rela- 1. A hearing structure comprising a beartionto the seat; a lock bolt journaled in the 4:, A hearing for pitmen comprising a semi-circular bearing block formed With a central seat for receiving a crank pin and provided with guide Ways at the opposite side of said seat, means for securing said block in position upon the end of a pitman, a follower block disposed between said guide Ways and adapted to partially ciroumscribe a crank pin, adjusting blocks adapted to be operated to move the follower block against the crank pin and lock means normally holding the follower block in its adjusted position and by which the follower block may be instantly released When desired,

5. In combination With a pitman rod a bearing structure adapted to be secured to the end thereof and comprising a bearing having a crank pin receiving seat parallel guides extending from opposite sides of said seat, follower block adapted to form a cap for the said seat, a cam-like bolt extending Within the follower block adapted. to adjust the relative position of the follower block to the l: earing a strap secured to and embracing the bearing and having its extremities secured to the pitman.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing Witnesses.

REUBEN C. BAKER. Witnesses:

T. K. DAHLE, Jr., JNo. JQHNSTON'E; 

